"Where" and "wherever" are neve used in front of adjectives such as "possible" and "necessary":
Adverbial clauses of reason answer the question Why?:
To say when something happened in the past, we use joining words (or conjunctions) like when, after, as, as soon as, before, by the time (that), once, since, until/till, while:
To say when something happened in the past, we use joining words (or conjunctions) like when, after, as, as soon as, before, by the time (that), once, since, until/till, while:
We can introduce contrast with conjunctions like although, considering (that), though, even though, even if, much as, etc:
We can use the past participle instead of the passive to join two sentences:
We often give reasons by using "joining words" (or conjunctions) like because, as, seeing (that), and since:
We use which or that (in place of noun subjects and it) to refer to animals and things:
We use who or that to refer to people. We use them in place of noun subjects or pronoun subjects (I, you, he, etc.) and we cannot omit them:
We use who(m) or that to refer to people. We use them in place of noun objects or object pronouns (me, you, him, etc.). We often say who instead of whom when we speak:
You can put "therefore" after the subject of the clause:
You can use "how" in questions and reported questions to talk about the method used to do something, and sometimes to indicate your surprise that it was possible to do it:
You never use words like "still," "nevertheless," or "just the same" in the main clause to add emphasis to the contrast:
You use "whose" in relative clauses to indicate who something belongs to or relates to: